<!DOCTYPE html>
<html>
 <head>
  <title>Bug 1122366 - margin collapsing</title>
  <style type="text/css">
  div {
    font: 40px/1em serif;
    height: 4em;
  }
  div.wrapper {
    margin: 10px;
    background: blue;
    border-left: green solid .5em;
    border-right: green solid 1.5em;
  }
  div.lr {
    -webkit-writing-mode: vertical-lr;
    writing-mode: tb-lr; /* IE11 */
    writing-mode: vertical-lr;
  }
  div.rl {
    -webkit-writing-mode: vertical-rl;
    writing-mode: tb-rl; /* IE11 */
    writing-mode: vertical-rl;
  }
  div.widthless
  {
    margin-right: 2em;
    width: 0;
  }
  </style>
 </head>
 <body>
  <div class="wrapper lr">
    <div class="widthless"></div>
    <div class="widthless"></div>
  </div>
  <div class="wrapper rl">
    <div class="widthless"></div>
    <div class="widthless"></div>
  </div>
 </body>
</html>
